package com.sice.www;

import java.util.Arrays;

public class MyArrayList implements IList {
    public int[]array;
    public int useSize;

    public MyArrayList(){
        this.array=new int[10];
    }


    @Override
    public void add(int data) {
        if(full()){
            grow();
        }
        this.array[useSize]=data;
        this.useSize++;
    }

    //扩容
    private void grow(){
        this.array= Arrays.copyOf(this.array,this.array.length*2);
    }

    @Override
    public void add(int pos, int data) {
        try {
            checkPos(pos);
            if(full()){
                grow();
            }

            for(int i=useSize-1;i>=pos;i--){
                array[i+1]=array[i];
            }
            array[pos]=data;

            useSize++;
        }catch (PosIllegal e){
            System.out.println("插入元素pos位置不合法");
            e.printStackTrace();
        }


    }

    private void checkPos(int pos) throws PosIllegal{
        if(pos<0||pos>useSize){
            throw new PosIllegal("Pos位置不合法");
        }
    }
    //判断是否包含
    @Override
    public boolean contains(int toFind) {
        for (int i = 0; i < useSize; i++) {
            if(array[i]==toFind){
                return true;
            }
        }
        return false;
    }

    @Override
    public int indexOf(int toFind) {
        for (int i = 0; i <useSize ; i++) {
            if(array[i]==toFind){
                return i;
            }
        }
        return 0;
    }

    @Override
    public int get(int pos) {

        try{
            checkEmpty();
            checkPos2(pos);
            return array[pos];
        }catch (PosIllegal e){
            e.printStackTrace();
        }catch (EmptyException e){
            e.printStackTrace();
        }
        return -1;
    }

    private void checkEmpty(){
        if(isEmpty()){
            throw new EmptyException("顺序表为空");
        }
    }

    public boolean isEmpty(){
        return useSize==0;
    }

    private void checkPos2(int pos) throws PosIllegal{
        if(pos<0||pos>=useSize){
            throw new PosIllegal("Pos位置不合法");
        }
    }

    //更新
    @Override
    public void set(int pos, int value) {
        try{
            checkEmpty();
            checkPos2(pos);
            array[pos]=value;
        }catch (PosIllegal e){
            e.printStackTrace();
        }catch (EmptyException e){
            e.printStackTrace();
        }
    }

    //删除
    @Override
    public void remove(int toRemove) {
        try{
            checkEmpty();
            int pos=indexOf(toRemove);
            if(pos==-1){
                return;
            }
            for (int i = pos; i < useSize-1; i++) {
                array[i]=array[i+1];
            }
            useSize--;
        }catch (EmptyException e){
            e.printStackTrace();
        }
    }

    @Override
    public int size() {
        return useSize;
    }

    @Override
    public void clear() {
        useSize=0;
    }

    @Override
    public void display() {
        for (int i = 0; i <this.useSize ; i++) {
            System.out.print(array[i]+" ");
        }
    }

    @Override
    public boolean full() {
        return this.useSize==array.length;
    }
}
